Greetings,
INPO will be coming to Surry Power Station
in a week and I would like to ask two questions to the group. In
your response, you do not need to reply to everyone. I will be gathering
the information and putting it into one excel file. If you would
like a copy, please let me know.
1) This question has been asked
already, but we did not get many responses. Core modeling is performed
using the CASMO-4/SIMULATE-3 computer codes. Our most recent Reactivity
Anomaly calculation(the comparison between measured and predicted boron
concentrations) gave us an uncorrected value of about 750pcm. This
is quite close to our tech spec limit of 1000pcm. If we corrected
for B-10, the anomaly value would be closer to 300pcm. Currently
we use the uncorrected value in our comparison to the predicted model.
What is your typical maximum offset between your measured and predicted
Reactivity Anomaly? Is this with or without B-10 depletion? Do
you use your B-10 depletion value for the tech spec surveillance?
2) This question is regarding
Estimated critical conditions/position. What is the pcm delta typically
observed at your plant between the predicted critical conditions and the
actual conditions? If a delta is observed, does the predicted critical
calculation account for B-10 depletion? At what point (i.e. >100
pcm delta) would Operations or Reactor Engineering write a condition report?
Charlene Chotalal
Lead Reactor Engineer
Surry Power Station
Work: (757)-365-2819
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